It could be:
* A misspelling of a real word: For example, "imitation" or "imitative".
* A word from a specific language: The pronunciation would depend on the language it comes from.
* A made-up word: The pronunciation would be up to the creator.
To get a correct pronunciation, please provide:
* The language the word is from (if known).
* The context in which you encountered the word.
* Any other information that might be helpful.
With more information, I can help you figure out how to pronounce "imitaawa".